jsp编程获取当前目录下的文件和目录及windows盘符的方法

Z时代
2024-01-10
分类：综合

本文实例讲述了jsp编程获取当前目录下的文件和目录及windows盘符的方法。分享给大家供大家参考，具体如下：

知识点

1 file对象的应用

2 listFiles()方法

3 isDirectory()方法,isFile()方法判断是否为目录或是文件

4转换字符串方法toString

(1)创建一个file对象dir,

然后用listFiles()方法返回当前目录下所有文件


String path=request.getRealPath("/");
File dir=new File(path);
File file[]=dir.listFiles();

(2)循环判断所返回的是否为目录,并显示出来:


<%
for(int i=0;i<file.length;i++)
{
  if(file[i].isDirectory())//
  out.print("<br>"+file[i].toString());
}
%>

(3)循环判断所返回的是否为目录,并显示出来：


<%
for(int i=0;i<file.length;i++)
{
  if(file[i].isFile())
  out.print("<br>"+file[i].toString());
}
%>

程序：


<%@ page contentType="text/html;charset=GB2312"%>
<%@ page import="java.io.*"%>
<html>
<title></title>
<body>
<%
String path=request.getRealPath("/");
File dir=new File(path);
File file[]=dir.listFiles();//用file对象的listFiles()方法返回指定目录下的文件
%>
当前<%=path%><br>
目录有:
<%
for(int i=0;i<file.length;i++)
{
  if(file[i].isDirectory())
  out.print("<br>"+file[i].toString());
}
%>
<p>文件有:
<%
for(int i=0;i<file.length;i++)
{
  if(file[i].isFile())
  out.print("<br>"+file[i].toString());
}
  %>
</body>
</html>

(二)获取windows盘符


<%@ page contentType="text/html;charset=GB2312"%>
<%@ page import="java.io.*"%>
<html>
<body>
<%
File[] roots=File.listRoots();
for(int i=0;i<roots.length;i++)
{
out.print("<br>"+roots[i].getPath());
}
%>
</body>
</html>

(三)将两个程序合并


<%@ page contentType="text/html;charset=GB2312"%>
<%@ page import="java.io.*,java.util.*,java.net.*" %>
<%!
private final static int languageNo=0; //语言版本，0 : 中文； 1：英文
String[] strDrivers   = {"驱动器","Drivers"};
String[] strCurrentFolder= {"当前目录","Current Folder"};
%>
<html>
<body>
<%
String path=request.getRealPath("/");
File dir=new File(path);
File file[]=dir.listFiles();//用file对象的listFiles()方法返回指定目录下的文件
StringBuffer sb=new StringBuffer(strDrivers[languageNo] + " : ");
File roots[]=File.listRoots();
for(int i=0;i<roots.length;i++)
{
  sb.append(" <a href=/"javascript:doForm('','"+roots[i]+"//','','','1','');/">");
  sb.append(roots[i]+"</a>&nbsp;");
}
//out.println(sb);
%>
<%
//out.print("<table border='1' width='100%' bgcolor='#FFFFFF' cellspacing=0 cellpadding=5 bordercolorlight=#000000 bordercolordark=#FFFFFF><tr><td>"+strCurrentFolder[languageNo]+":<br><b>"+path+"</td><td>"+sb+"</td></tr></table>");
%>
<table border='1' width='100%' bgcolor='#FFFFFF' cellspacing=0 cellpadding=5 bordercolorlight=#000000 bordercolordark=#FFFFFF>
<tr>
<td width='40%'><%=strCurrentFolder[languageNo]%>:<br><%=path %></td><td width='60%'><%=strDrivers[languageNo] %>:<%=sb%></td></tr>
</table>
<table border='1' width='100%' bgcolor='#FFFFFF' cellspacing=0 cellpadding=5 bordercolorlight=#000000 bordercolordark=#FFFFFF>
<tr>
<td width='40%'>目录有:
<%
for(int i=0;i<file.length;i++)
{
  if(file[i].isDirectory())
  out.print("<br>"+file[i].toString());
}
%>
</td>
<td width='60%'>文件有:
<%
for(int i=0;i<file.length;i++)
{
  if(file[i].isFile())
  out.print("<br>"+file[i].toString());
}
  %>
</td>
</tr>
</table>
</body>
</html>

我们进一步的优化,实现


<%@ page contentType="text/html; charset=GBK" %>
<%@page import="java.io.*,java.util.*,java.net.*" %>
<head>
<style type="text/css">
td,select,input,body{font-size:9pt;}
A { text-decoration: none }
#tablist{
padding: 5px 0;
margin-left: 0;
margin-bottom: 0;
margin-top: 0.1em;
font:9pt;
}
#tablist li{
list-style: none;
display: inline;
margin: 0;
}
#tablist li a{
padding: 3px 0.5em;
margin-left: 3px;
border: 1px solid ;
background: #FFFFFF;
}
#tablist li a:link, #tablist li a:visited{
color: navy;
}
#tablist li a.current{
background: #FFFFFF;
}
#tabcontentcontainer{
width: 100%;
padding: 5px;
border: 1px solid black;
}
.tabcontent{
display:none;
}
</style>
</head>
<%!
private final static int languageNo=1; //语言版本，0 : 中文； 1：英文
String[] strCurrentFolder= {"当前目录","Current Folder"};
String[] strDrivers   = {"驱动器","Drivers"};
String[] strFileName   = {"文件名称","File Name"};
String[] strFileSize   = {"文件大小","File Size"};
String[] strLastModified = {"最后修改","Last Modified"};
String[] strFileOperation= {"文件操作","Operations"};
String[] strFileEdit   = {"修改","Edit"};
String[] strFileDown   = {"下载","Download"};
String[] strFileCopy   = {"复制","Move"};
String[] strFileDel   = {"删除","Delete"};
String getDrivers() 
{ 
StringBuffer sb=new StringBuffer(": "); 
File roots[]=File.listRoots(); 
for(int i=0;i<roots.length;i++) 
{ 
sb.append("<a href='?path="+roots[i]+"'>"); 
sb.append(roots[i]+"</a> &nbsp;&nbsp;"); 
} 
return sb.toString(); 
}
String formatPath(String p)
{
StringBuffer sb=new StringBuffer();
for (int i = 0; i < p.length(); i++) 
{
  if(p.charAt(i)=='//')
  {
  sb.append("////");
  }
  else
  {
  sb.append(p.charAt(i));
  }
}
return sb.toString();
}
public static String toChinese(String str)
{
  try{
  if(str==null)
  {
   return "";
  }else
  {
   str=new String(str.getBytes("ISO8859_1"),"GBK");
   return str;
  }
  }catch(Exception e)
  {
  return "";
  }
}
%>
<%
request.setCharacterEncoding("gb2312");
String strDir =toChinese( request.getParameter("path")); 
if(strDir==null||strDir.length()<1)
{
strDir = request.getRealPath("/");
}
StringBuffer sb=new StringBuffer(""); 
StringBuffer sbFile=new StringBuffer(""); 
try 
{
File objFile = new File(strDir); 
File list[] = objFile.listFiles(); 
if(objFile.getAbsolutePath().length()>3) 
{ 
sb.append("<tr><td >&nbsp;</td><td><a href='?path="+formatPath(objFile.getParentFile
().getAbsolutePath())+"'>"); 
sb.append("To ParentFile</a><br>- - - - </td></tr>/r/n"); 
} 
for(int i=0;i<list.length;i++) 
{ 
if(list[i].isDirectory()) 
{ 
sb.append("<tr><td>&nbsp;</td><td>"); 
sb.append("<a href='?path="+formatPath(list[i].getAbsolutePath())+"'>"+list[i].getName()+"</a>"); 
sb.append("</td></tr>");
} 
else 
{ 
String strLen=""; 
String strDT=""; 
long lFile=0; 
lFile=list[i].length();
if(lFile>1000000) 
{ 
lFile=lFile/1000000; 
strLen="" + lFile + " M"; 
} 
else if(lFile>1000) 
{ 
lFile=lFile/1000; 
strLen="" + lFile + " K"; 
} 
else 
{ 
strLen="" + lFile + " Byte"; 
} 
Date dt=new Date(list[i].lastModified()); 
strDT=dt.toLocaleString(); 
sbFile.append("<tr><td>"); 
sbFile.append(""+list[i].getName()); 
sbFile.append("</td><td>"); 
sbFile.append(""+strLen); 
sbFile.append("</td><td>"); 
sbFile.append(""+strDT); 
sbFile.append("</td><td>");
sbFile.append(" <a href=>");
sbFile.append(strFileEdit[languageNo]+"</a> ");
sbFile.append(" <a href=>");
sbFile.append(strFileDown[languageNo]+"</a> ");
sbFile.append(" <a href=>");
sbFile.append(strFileCopy[languageNo]+"</a> ");
sbFile.append(" <a href=>");
sbFile.append(strFileDel[languageNo]+"</a> ");
sbFile.append("</td></tr>/r/n"); 
} 
} 
} 
catch(Exception e) 
{ 
out.println("<font color=red>error： "+e.toString()+"</font>"); 
} 
%>
<table border='1' width='100%' bgcolor='#FFFFFF' cellspacing=0 cellpadding=5 bordercolorlight=#000000 bordercolordark=#FFFFFF>
<tr>
<td width='20%'><%=strCurrentFolder[languageNo]%>:<br><%=strDir %></td><td width='70%'><%=strDrivers[languageNo] %><%=getDrivers()%>
</td>
</tr>
</table>
<table border='1' width='100%' bgcolor='#FFFFFF' cellspacing=0 cellpadding=5 bordercolorlight=#000000 bordercolordark=#FFFFFF>
<tr>
<td width='20%'valign="top">
<table >
<tr><td><%=sb%></td>
</tr>
</table>
</td>
<td width='70%'align="center" valign="top">
<table width="100%"border="1" cellspacing="1" cellpadding="4" bordercolorlight="#000000" bordercolordark="#FFFFFF">
<tr>
<td width="26%" align="center"><%=strFileName[languageNo] %></td>
<td width="19%" align="center"><%=strFileSize[languageNo] %></td>
<td width="29%" align="center"><%=strLastModified[languageNo] %></td>
<td width="26%" align="center"><%=strFileOperation[languageNo] %></td></tr>
<tr><td width="25%" align="center"><%=sbFile %></td></tr>
</table>
</td>
</tr>
</table>